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Could be,Foreign material (dirt, rust, etc) caught in the needle and seat,Bad float,Float is out of adjustment,
It is in the float chamber of the carburetor.
float valve most likely has some grit under it or the float is bad or out of adjustment this part of the carburetor regulates the amount of fuel into the bowl from the fuel pump ASE certified master tech / L1
That's typically caused by a worn "needle and seat" assembly. You can purchase a needle and seat assembly for a specific carburetor, but it's best to purchase a rebuild kit and do the whole thing.
The float is located inside the carburetor.
If the carburetor is cleaned on the Yamaha Bruin 350 and it will idle but stall when given gas, it could be that the float is sticking. The carburetor may also need to be adjusted by turning the adjustment screw so that it is not getting too much gas when revved.
I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.
Have you checked to see if the float has a hole in it allowing fuel to weight it down? Possibly the needle valve is sticking and not the float. Could also be the float needs adjusting. You need to open the carburetor up and see what is going on.
Almost All engines with a carburetor have a float valve. The exception is a carburetor Built by Tillotson, horrible things but they worked upside down.
A bad, stuck or dirty float needle inside the carburetor.
Float may be sticking or have a hole in it.
98 Dodge van does not have a carburetor-it has a throttle body= no float